Here be treasure ......
GCSE Combined Science (Chemistry) and also GCSE ("Triple") Chemistry stuff to help with homeworks, revision and much of the out-of-lessons work.
Exam papers :
GCSE Combined Science (Chem) FOUNDATION tier papers
other exam question practise stuff :
Quick-fire practise to build and reinforce existing knowledge.
This makes a good bridge between some revision of the original lesson and your first attempts at exam questions.
Knowledge organisers (by AQA GCSE Chem unit)
Quick recall quizzes (using "Quizlet") : unit-by-unit
(including CGP workbook ANSWERS)
Quantitative REVISION (paper 1) much of the calculation stuff
gcse BIOLOGY homepage gcse PHYSICS homepage